<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>04-JS输入输出语句</title>
    <script>
        // 这是输入框
        prompt('请输入你的年龄');
        // alert弹出警示框
        alert('计算输出结果');
        // console 控制台输出 给程序员看的
        console.log('我是程序员');
    </script>
</head>

<body>

</body>

</html>